With out a BHN tester, pretty diff to get any good idea. I am betting hardcast, 18BHN or so. The bevelk base doesn't help either. I have BB bullets, but they can be early bbl leaders too. The place you bought them from should have something on their site telling you what the BHN is. Did you mic them, make sure they are 0.452" & not 0.451"? There are companies making both sizes for smoe reason. Most get better results w/ bullets slightly larger than slightly smaller. You pistols bbl could have an over size throat too, not uncommon. Another reason to use a softer bullet. I know it sounds counterintuative, but you want the bullet to start sealing the bore as soon as it hits rifling. A hard bullet won't do that until well into the bore.
You could check the bbl by driving an oversized bullet into the throat & then another all the way thru the bbl. Measure them, see if the throat is larger than groove dia. Then go 0.001" larger than groove dia. If the throat is larger, match the throat dia. Again, tough to do with commercial cast as most just don't offer custom sizing. I think if you just find a commercial caster making softer bullets, like Missouri Bullets, get them 0.452" & you'll probably see better results. Then sopme bbls are just rough & never shoot a lead bullet w/o leading.